diff --git a/AppleCommon/GBAudioClient.h b/AppleCommon/GBAudioClient.h
index 03ed701..b361411 100644
--- a/AppleCommon/GBAudioClient.h
+++ b/AppleCommon/GBAudioClient.h
@@ -5,8 +5,8 @@
 @property (nonatomic, strong) void (^renderBlock)(UInt32 sampleRate, UInt32 nFrames, GB_sample_t *buffer);
 @property (nonatomic, readonly) UInt32 rate;
 @property (nonatomic, readonly, getter=isPlaying) bool playing;
--(void) start;
--(void) stop;
--(id) initWithRendererBlock:(void (^)(UInt32 sampleRate, UInt32 nFrames, GB_sample_t *buffer)) block
+- (void)start;
+- (void)stop;
+- (id)initWithRendererBlock:(void (^)(UInt32 sampleRate, UInt32 nFrames, GB_sample_t *buffer)) block
               andSampleRate:(UInt32) rate;
 @end
diff --git a/AppleCommon/GBAudioClient.m b/AppleCommon/GBAudioClient.m
index e650aaf..c0c1b89 100644
--- a/AppleCommon/GBAudioClient.m
+++ b/AppleCommon/GBAudioClient.m
@@ -23,7 +23,7 @@ static OSStatus render(
     AudioComponentInstance audioUnit;
 }
 
--(id) initWithRendererBlock:(void (^)(UInt32 sampleRate, UInt32 nFrames, GB_sample_t *buffer)) block
+- (id)initWithRendererBlock:(void (^)(UInt32 sampleRate, UInt32 nFrames, GB_sample_t *buffer)) block
               andSampleRate:(UInt32) rate
 {
     if (!(self = [super init])) { 
diff --git a/Cocoa/Document.xib b/Cocoa/Document.xib
index 47b8a4a..476aad7 100644
--- a/Cocoa/Document.xib
+++ b/Cocoa/Document.xib
@@ -225,7 +225,7 @@
                                     <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="onn-R8-3vg" customClass="GBDebuggerButton">
                                         <rect key="frame" x="102" y="26" width="26" height="26"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                                        <buttonCell key="cell" type="bevel" title="Step Backwards" alternateTitle="backstep" bezelStyle="rounded" image="BackstepTemplate" imagePosition="only" alignment="center" enabled="NO" imageScaling="proportionallyDown" inset="2" id="WtK-kD-bf6">
+                                        <buttonCell key="cell" type="bevel" title="Step Backward" alternateTitle="backstep" bezelStyle="rounded" image="BackstepTemplate" imagePosition="only" alignment="center" enabled="NO" imageScaling="proportionallyDown" inset="2" id="WtK-kD-bf6">
                                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                                             <font key="font" metaFont="system"/>
                                         </buttonCell>
diff --git a/Core/debugger.c b/Core/debugger.c
index c5b35cd..60eafcd 100644
--- a/Core/debugger.c
+++ b/Core/debugger.c
@@ -2144,7 +2144,7 @@ static const debugger_command_t commands[] = {
     {"step", 1, step, "Run the next instruction, stepping into function calls"},
     {"finish", 1, finish, "Run until the current function returns"},
 #ifndef DISABLE_REWIND
-    {"backstep", 5, backstep, "Step one instruction backwards, assuming constant inputs"},
+    {"backstep", 5, backstep, "Step one instruction backward, assuming constant inputs"},
     {"bs", 2, }, /* Alias */
 #endif
     {"undo", 1, undo, "Revert the last command"},
diff --git a/Core/gb.c b/Core/gb.c
index 445f84e..9e9ca49 100644
--- a/Core/gb.c
+++ b/Core/gb.c
@@ -1065,13 +1065,13 @@ exit:
 }
 
 /* Loading will silently stop if the format is incomplete */
-void GB_load_battery(GB_gameboy_t *gb, const char *path)
+int GB_load_battery(GB_gameboy_t *gb, const char *path)
 {
     GB_ASSERT_NOT_RUNNING_OTHER_THREAD(gb)
     
     FILE *f = fopen(path, "rb");
     if (!f) {
-        return;
+        return errno;
     }
 
     if (fread(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
@@ -1090,7 +1090,7 @@ void GB_load_battery(GB_gameboy_t *gb, const char *path)
             /* We must reset RTC here, or it will not advance. */
             goto reset_rtc;
         }
-        return;
+        return 0;
     }
     
     if (gb->cartridge_type->mbc_type == GB_HUC3) {
@@ -1109,7 +1109,7 @@ void GB_load_battery(GB_gameboy_t *gb, const char *path)
             /* We must reset RTC here, or it will not advance. */
             goto reset_rtc;
         }
-        return;
+        return 0;
     }
 
     rtc_save_t rtc_save;
@@ -1174,7 +1174,7 @@ reset_rtc:
     }
 exit:
     fclose(f);
-    return;
+    return 0;
 }
 
 unsigned GB_run(GB_gameboy_t *gb)
diff --git a/Core/gb.h b/Core/gb.h
index db07786..1827508 100644
--- a/Core/gb.h
+++ b/Core/gb.h
@@ -956,7 +956,7 @@ int GB_save_battery_to_buffer(GB_gameboy_t *gb, uint8_t *buffer, size_t size);
 int GB_save_battery(GB_gameboy_t *gb, const char *path);
 
 void GB_load_battery_from_buffer(GB_gameboy_t *gb, const uint8_t *buffer, size_t size);
-void GB_load_battery(GB_gameboy_t *gb, const char *path);
+int GB_load_battery(GB_gameboy_t *gb, const char *path);
 
 void GB_set_turbo_mode(GB_gameboy_t *gb, bool on, bool no_frame_skip);
 void GB_set_rendering_disabled(GB_gameboy_t *gb, bool disabled);
diff --git a/JoyKit/JOYController.m b/JoyKit/JOYController.m
index 21d7565..c473ec6 100644
--- a/JoyKit/JOYController.m
+++ b/JoyKit/JOYController.m
@@ -1450,7 +1450,7 @@ typedef union {
     }
 }
 
-- (uint8_t)LEDMaskForPlayer:(unsigned int)player
+- (uint8_t)LEDMaskForPlayer:(unsigned)player
 {
     return player;
 }
diff --git a/Makefile b/Makefile
index 1ab2b3e..0666096 100644
--- a/Makefile
+++ b/Makefile
@@ -181,7 +181,7 @@ endif
 
 # These must come before the -Wno- flags
 WARNINGS += -Werror -Wall -Wno-unknown-warning -Wno-unknown-warning-option -Wno-missing-braces
-WARNINGS += -Wno-nonnull -Wno-unused-result -Wno-multichar -Wno-int-in-bool-context -Wno-format-truncation
+WARNINGS += -Wno-nonnull -Wno-unused-result -Wno-multichar -Wno-int-in-bool-context -Wno-format-truncation -Wno-nullability-completeness
 
 # Only add this flag if the compiler supports it
 ifeq ($(shell $(CC) -x c -c $(NULL) -o $(NULL) -Werror -Wpartial-availability 2> $(NULL); echo $$?),0)
@@ -787,7 +787,7 @@ $(OBJ)/debian-binary:
 $(LIBDIR)/libsameboy.o: $(CORE_OBJECTS)
 	-@$(MKDIR) -p $(dir $@)
 	@# This is a somewhat simple hack to force Clang and GCC to build a native object file out of one or many LTO objects
-	echo "static const char __attribute__((used)) x=0;"| $(CC) $(filter-out -flto,$(CFLAGS)) -c -x c - -o $(OBJ)/lto_hack.o
+	echo "static const char __attribute__((used)) x=0;"| $(CC) $(filter-out -flto,$(CFLAGS)) $(FAT_FLAGS) -c -x c - -o $(OBJ)/lto_hack.o
 	@# And this is a somewhat complicated hack to invoke the correct LTO-enabled LD command in a mostly cross-platform nature
 	$(CC) $(FAT_FLAGS) $(CFLAGS) $(LIBFLAGS) $^ $(OBJ)/lto_hack.o -o $@
 	-@rm $(OBJ)/lto_hack.o
diff --git a/SDL/configuration.h b/SDL/configuration.h
index a3739a4..a5123e9 100644
--- a/SDL/configuration.h
+++ b/SDL/configuration.h
@@ -151,7 +151,7 @@ typedef struct {
         char audio_driver[16];
         /* v0.15.2 */
         bool allow_background_controllers;
-        bool gui_pallete_enabled; // Change the GUI palette only once the user changed the DMG palette
+        bool gui_palette_enabled; // Change the GUI palette only once the user changed the DMG palette
         char dmg_palette_name[25];
         hotkey_action_t hotkey_actions[2];
         uint16_t agb_revision;
diff --git a/SDL/gui.c b/SDL/gui.c
index 427b219..2edb600 100644
--- a/SDL/gui.c
+++ b/SDL/gui.c
@@ -1383,7 +1383,7 @@ static void cycle_palette(unsigned index)
     else {
         configuration.dmg_palette++;
     }
-    configuration.gui_pallete_enabled = true;
+    configuration.gui_palette_enabled = true;
     update_gui_palette();
 }
 
@@ -1414,7 +1414,7 @@ static void cycle_palette_backwards(unsigned index)
     else {
         configuration.dmg_palette--;
     }
-    configuration.gui_pallete_enabled = true;
+    configuration.gui_palette_enabled = true;
     update_gui_palette();
 }
 
@@ -2164,7 +2164,7 @@ void run_gui(bool is_running)
     
     /* Draw the background screen */
     if (!converted_background) {
-        if (configuration.gui_pallete_enabled) {
+        if (configuration.gui_palette_enabled) {
             update_gui_palette();
         }
         else {
diff --git a/SDL/main.c b/SDL/main.c
index 5ec2d33..9d4eecc 100644
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -1169,7 +1169,7 @@ int main(int argc, char **argv)
         configuration.sgb_revision %= SGB_MAX;
         configuration.dmg_palette %= 5;
         if (configuration.dmg_palette) {
-            configuration.gui_pallete_enabled = true;
+            configuration.gui_palette_enabled = true;
         }
         configuration.border_mode %= GB_BORDER_ALWAYS + 1;
         configuration.rumble_mode %= GB_RUMBLE_ALL_GAMES + 1;
diff --git a/iOS/GBBackgroundView.m b/iOS/GBBackgroundView.m
index 90bff61..55ecac7 100644
--- a/iOS/GBBackgroundView.m
+++ b/iOS/GBBackgroundView.m
@@ -5,14 +5,14 @@
 #import "GBViewController.h"
 #import "GBROMManager.h"
 
-double CGPointSquaredDistance(CGPoint a, CGPoint b)
+static double CGPointSquaredDistance(CGPoint a, CGPoint b)
 {
     double deltaX = a.x - b.x;
     double deltaY = a.y - b.y;
     return deltaX * deltaX + deltaY * deltaY;
 }
 
-double CGPointAngle(CGPoint a, CGPoint b)
+static double CGPointAngle(CGPoint a, CGPoint b)
 {
     double deltaX = a.x - b.x;
     double deltaY = a.y - b.y;
@@ -117,6 +117,12 @@ static GB_key_mask_t angleToKeyMask(double angle)
     self.usesSwipePad = self.usesSwipePad;
 }
 
+- (void)setDefaultScreenLabel
+{
+    _screenLabel.text = @"Tap the Game Boy screen to open the menu and load a ROM from the library.";
+}
+
+
 - (instancetype)initWithLayout:(GBLayout *)layout;
 {
     self = [super initWithImage:nil];
@@ -126,12 +132,12 @@ static GB_key_mask_t angleToKeyMask(double angle)
     _touches = [NSMutableSet set];
     
     _screenLabel = [[UILabel alloc] initWithFrame:CGRectZero];
-    _screenLabel.text = @"Tap the Game Boy screen to open the menu and load a ROM from the library.";
     _screenLabel.font = [UIFont systemFontOfSize:20 weight:UIFontWeightMedium];
     _screenLabel.textAlignment = NSTextAlignmentCenter;
     _screenLabel.textColor = [UIColor whiteColor];
     _screenLabel.lineBreakMode = NSLineBreakByWordWrapping;
     _screenLabel.numberOfLines = 0;
+    [self setDefaultScreenLabel];
     [self addSubview:_screenLabel];
     
     _dpadView = [[UIImageView alloc] initWithImage:[_layout.theme imageNamed:@"dpad"]];
diff --git a/iOS/GBHub.m b/iOS/GBHub.m
index 73c60fe..b676bf5 100644
--- a/iOS/GBHub.m
+++ b/iOS/GBHub.m
@@ -291,7 +291,7 @@ static NSURL *StringToWebURL(NSString *string)
     }] resume];
 }
 
-- (unsigned int)countForTag:(NSString *)tag
+- (unsigned)countForTag:(NSString *)tag
 {
     return _tags[tag].unsignedIntValue;
 }
diff --git a/iOS/GBROMManager.m b/iOS/GBROMManager.m
index dcd9d4a..a1cccde 100644
--- a/iOS/GBROMManager.m
+++ b/iOS/GBROMManager.m
@@ -1,5 +1,6 @@
 #import "GBROMManager.h"
 #import <copyfile.h>
+#import <sys/stat.h>
 
 @implementation GBROMManager
 {
diff --git a/iOS/GBROMViewController.m b/iOS/GBROMViewController.m
index d3c087b..bb6b1e8 100644
--- a/iOS/GBROMViewController.m
+++ b/iOS/GBROMViewController.m
@@ -38,7 +38,9 @@
 {
     UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
     cell.textLabel.text = rom.lastPathComponent;
-    cell.accessoryType = [rom isEqualToString:[GBROMManager sharedManager].currentROM]? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
+    bool isCurrentROM = [rom isEqualToString:[GBROMManager sharedManager].currentROM];
+    bool checkmark = isCurrentROM;
+    cell.accessoryType = checkmark? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
     
     NSString *pngPath = [[[GBROMManager sharedManager] autosaveStateFileForROM:rom] stringByAppendingPathExtension:@"png"];
     UIGraphicsBeginImageContextWithOptions((CGSize){60, 60}, false, self.view.window.screen.scale);
@@ -94,7 +96,8 @@
 
 - (void)romSelectedAtIndex:(unsigned)index
 {
-    [GBROMManager sharedManager].currentROM = [GBROMManager sharedManager].allROMs[index];
+    NSString *rom = [GBROMManager sharedManager].allROMs[index];
+    [GBROMManager sharedManager].currentROM = rom;
     [self.presentingViewController dismissViewControllerAnimated:true completion:nil];
 }
 
@@ -286,7 +289,7 @@ contextMenuConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath
           forRowAtIndexPath:indexPath];
         }];
         deleteAction.attributes = UIMenuElementAttributesDestructive;
-        return [UIMenu menuWithTitle:nil children:@[
+        NSMutableArray *items = @[
             [UIAction actionWithTitle:@"Rename"
                                 image:[UIImage systemImageNamed:@"pencil"]
                            identifier:nil
@@ -299,8 +302,9 @@ contextMenuConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath
                               handler:^(__kindof UIAction *action) {
                 [self duplicateROMAtIndex:indexPath.row];
             }],
-            deleteAction,
-        ]];
+        ].mutableCopy;
+        [items addObject:deleteAction];
+        return [UIMenu menuWithTitle:nil children:items];
     }];
 }
 
diff --git a/iOS/GBSettingsViewController.m b/iOS/GBSettingsViewController.m
index 1403c92..0a59487 100644
--- a/iOS/GBSettingsViewController.m
+++ b/iOS/GBSettingsViewController.m
@@ -351,9 +351,8 @@ static NSString const *typeLightTemp = @"typeLightTemp";
         },
     ];
     
-    return @[
-        @{
-            @"items": @[
+    
+    NSArray *rootItems = @[
                     @{
                         @"title": @"Emulation",
                         @"type": typeSubmenu,
@@ -384,7 +383,12 @@ static NSString const *typeLightTemp = @"typeLightTemp";
                         @"class": [GBThemesViewController class],
                         @"image": [UIImage imageNamed:@"themeSettings"],
                     },
-            ]
+    ];
+    
+
+     return @[
+        @{
+            @"items": rootItems,
         }
     ];
 }
@@ -716,7 +720,9 @@ static id ValueForItem(NSDictionary *item)
         }
     }
     else if (item[@"type"] == typeRadio) {
-        if ([ValueForItem(item) isEqual:item[@"value"]]) {
+        id settingValue = ValueForItem(item);
+        id itemValue = item[@"value"];
+        if (settingValue == itemValue || [settingValue isEqual:itemValue]) {
             cell.accessoryType = UITableViewCellAccessoryCheckmark;
         }
     }
diff --git a/iOS/GBViewController.m b/iOS/GBViewController.m
index b2a1046..992456c 100644
--- a/iOS/GBViewController.m
+++ b/iOS/GBViewController.m
@@ -640,7 +640,10 @@ static void rumbleCallback(GB_gameboy_t *gb, double amp)
 
 - (void)saveStateToFile:(NSString *)file
 {
-    GB_save_state(&_gb, file.fileSystemRepresentation);
+    NSString *tempPath = [file stringByAppendingPathExtension:@"tmp"];
+    if (!GB_save_state(&_gb, tempPath.UTF8String)) {
+        rename(tempPath.UTF8String, file.UTF8String);
+    }
     NSData *data = [NSData dataWithBytes:_gbView.previousBuffer
                                   length:GB_get_screen_width(&_gb) *
                     GB_get_screen_height(&_gb) *
diff --git a/iOS/main.m b/iOS/main.m
index c75fe83..1bd18be 100644
--- a/iOS/main.m
+++ b/iOS/main.m
@@ -11,7 +11,7 @@ int main(int argc, char * argv[])
             @"GBColorCorrection": @(GB_COLOR_CORRECTION_MODERN_BALANCED),
             @"GBAudioMode": @"switch",
             @"GBHighpassFilter": @(GB_HIGHPASS_ACCURATE),
-            @"GBRewindLength": @(120),
+            @"GBRewindLength": @120,
             @"GBFrameBlendingMode": @(GB_FRAME_BLENDING_MODE_ACCURATE),
             
             @"GBDMGModel": @(GB_MODEL_DMG_B),